Metric adapters: There are two standards: JIS and DIN. Look carefully at the parts below. Some are identified by JIS and others DIN. We have the actual measurements of each part in the description of the part. So read carefully to find the right part. NOTE: The unions below show the actual metric opening NOT the nominal size. Just read the description and view the picture if you have any doubts!

Here is a chart that might help you identify which metric pipe you have: